colorbar of image

Thu May 31 04:18:05 EDT 2012

that is my script
from matplotlib import pyplot
img = pyplot.imread('image.png')
pyplot.imshow(img)
pyplot.show()
the problem is i want to display either colorbar associated to the 
image and image or just colorbar associated to the image when i 
download image.png.how can i do?
tk's
mireille
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